new Vue({
  el: '#root',

  data: {
    introImgIndex: 0,
    introImgs: [
      'https://www.ziweiyang.com/upload/images/ebook_category/img/20150507103226_107.jpg',
      'https://www.ziweiyang.com/upload/images/coursebook_category/img/20150504112616_16.jpg',
      'https://www.ziweiyang.com/upload/images/ebook_category/img/20150507103226_107.jpg',
      'https://www.ziweiyang.com/upload/images/coursebook_category/img/20150504112616_16.jpg',
    ],
  },

  methods: {
    onClickIntroImg (i) {
      this.introImgIndex = i
    },
  },
})